JPH08275651A - String blade-type bush cutter - Google Patents

Abstract

PURPOSE: To provide the subject bush cutter provided with an engine at one end of an operation rod and a head member rotatably sending out a string blade through a gear case at the other end of the operation rod. CONSTITUTION: This string blade-type bush cutter is provided with an engine attached at one end of an operation rod 2 and a head member 4 rotatably sending out a string blade 14 through a gear case 3 at the other end of the operation rod 2. In this bush cutter, a string-blade breakage-preventing board 16 projecting outside at the upper face of the head member 4 is placed between the gear case 3 and the head member 4 in a state to rotate integrally with the head member 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a string blade type brush cutter having an engine at one end of a control rod and a string blade head for rotatably extending a string blade at the other end through a gear case.

[0002]

2. Description of the Related Art In a string blade type brush cutter in the above fields,
Hitherto, no means has been provided for protecting the string blade, which is made of a rope such as a nylon rope that extends from a head portion extending from the string blade.

Therefore, when mowing work is performed with such a brush cutter, for example, when trying to cut a slightly thicker stem, the string blade is wound around the stem, or the root of the string blade hits the stem. Then, it is often experienced that the string blade is cut off from the root and the work cannot be continued.

[0004]

SUMMARY OF THE INVENTION Here, the present invention, when performing mowing work with this seed-blade type brush cutter,
The string blade prevents breakage due to winding around the object near the root of the string blade or the root hitting the object, thereby reducing the number of times the string blade needs to be replaced and improving work efficiency. Is.

[0005]

That is, according to the present invention, the engine (1) is provided at one end of the operating rod (2) and the gear case (3) is provided at the other end.
In a string blade type brush cutter having a head portion (4) that rotatably extends the string blade (14) through, between the gear case (3) and the head portion (4), The head portion (4) is provided with a string blade break prevention plate (16) protruding laterally from the upper surface so as to rotate integrally with the head portion (4), and in practice, the string blade break prevention plate (16) is the head part (4). The head portion (4) is directly above the head portion (4) and has a larger disc shape than the head portion (4).

[0006]

When performing a mowing operation with the brush cutter having the above structure, the string blade made of nylon rope or the like has only the tip end protruding outward from the string blade break prevention plate as the object (grass). This means that the cutting operation is carried out first, and the string blade will not be wastefully cut from the root by hitting the object near the root or the root of the string blade.

[0007]

1 is an overall view of a string blade type brush cutter, FIG. 2 is a perspective view of a head portion thereof, and FIG. 3 is a sectional view showing a portion shown in FIG.

A head portion 4 is formed at the other end of the operating rod 2 having the engine 1 shown in FIG. 1 at one end through a gear case 3, and an intermediate portion of the operating rod 2 is formed. A handle 5 is attached.

In FIGS. 2 and 3, a shaft 8 which penetrates the hollow portion 6 of the operating rod 2 and is supported by a bearing 7 is rotationally driven by the engine 1 and is attached to the end of the shaft 8. Bevel gear 1 meshing with bevel gear 9
0 rotates the rotary shaft 13 supported in the gear case 3 between the bearings 11 and 12.

At the end of the rotary shaft 13, the head portion 4 is provided.
As is known in the art, in the head portion 4, a plurality of cord blades 14 made of nylon rope, for example, are extended radially from several positions on the circumference, and these cord blades 14 are As the head section 4 rotates, it hits an object such as grass and cuts it.

In the present invention, between the gear case 3 and the head portion 4, there is provided a string blade break prevention plate 16 having a rising edge 15 on the outer periphery thereof. Reference numeral 16 is directly above the head portion 4, and is formed in a disk shape having a diameter larger than that of the head portion 4.

As a manner of mounting the string blade breakage prevention plate 16, the string blade breakage prevention plate 16 is sandwiched between a boss 18 screwed into a screw portion 17 formed on the outer surface of the rotary shaft 13 and the head portion 4. Then, the threaded portion 17 of the rotary shaft 13
The nut 20 is screwed and fastened to the end of the nut via the washer 19. Depending on the type of the head portion 4, it may be considered to tighten the string blade breakage prevention plate 16 at the head portion 4 itself.

When performing a mowing operation with the string blade type brush cutter having the above structure, the string blade 14 is provided with a string blade cutting prevention plate 16
Since only the part protruding outward from the object hits an object such as grass, the base of the string blade 14 hits the object, and the string blade 14
It is possible to avoid the situation where the person is disconnected from the root. Of course, the string blade 14 is the string blade break prevention plate 16
Since they rotate integrally with each other, they do not break even if they come into contact with each other. The string blade breakage prevention plate 16 is made of an aluminum plate or a steel plate from which an acute angle portion has been removed, or a transparent plastic plate in consideration of the visibility.

[0014]

According to the string blade type lawnmower having the above-described structure of the present invention, since the string blade cutting prevention plate is provided, the base of the string blade made of nylon rope protruding from the head portion. It is possible to prevent such a situation that it is cut from the part of, and thus it is possible to significantly reduce the consumption of the rope for the string blade in this seed mower,
In addition to the economic effect, the operation effect can be obtained in that the interruption of the work can be avoided.

[Brief description of drawings]

FIG. 1 is a perspective view of the entire string blade type brush cutter of the present invention.

FIG. 2 is a perspective view of a head portion of the string blade type brush cutter of the present invention.

FIG. 3 is a cross-sectional view showing a portion of FIG. 2 in a slightly enlarged manner.

[Explanation of symbols]

 1 Engine 2 Control Rod 3 Gear Case 4 Head Part 14 String Blade (Nylon Rope) 16 String Blade Break Prevention Plate

Claims (2)

[Claims] 1. An engine (1) is provided at one end of an operating rod (2), and a head portion (4) is provided at the other end of the operating rod (2) for extending a string blade (14) rotatably via a gear case (3). In a string blade type brush cutter, the head portion (4) is provided between the gear case (3) and the head portion (4).
A string blade type brush cutter comprising a string blade break prevention plate (16) protruding laterally from the upper surface of the head so as to be rotatable integrally with the head portion (4). 2. The cord cutting prevention plate (16) is placed directly above the head portion (4), and is formed in a disc shape having a diameter larger than that of the head portion (4). String blade type brush cutter.